<?php
namespace MazlanHalim\IntelliLanz\Detection;

use MazlanHalim\IntelliLanz\Graph\Node;

final class PluginDetector implements DetectorInterface {
    public function detect(): array {
        // Plugin inventory functions are not loaded by default in REST requests.
        if ( ! function_exists( 'get_plugins' ) ) {
            require_once ABSPATH . 'wp-admin/includes/plugin.php';
        }
        $nodes = array();
        foreach ( array( 'standard' => get_plugins(), 'must-use' => get_mu_plugins() ) as $kind => $plugins ) {
            foreach ( $plugins as $file => $data ) {
                $must_use = $kind === 'must-use';
                $network_active = ! $must_use && is_multisite() && is_plugin_active_for_network( $file );
                $active = $must_use || $network_active || is_plugin_active( $file );
                $name = sanitize_text_field( $data['Name'] ?? '' );
                $slug = dirname( $file ) === '.' ? basename( $file, '.php' ) : dirname( $file );
                // Read only relationship headers; also supports WordPress before 6.5.
                $headers = get_file_data(
                    ( $must_use ? WPMU_PLUGIN_DIR : WP_PLUGIN_DIR ) . '/' . $file,
                    array( 'RequiresPlugins' => 'Requires Plugins', 'WCRequiresAtLeast' => 'WC requires at least' )
                );
                $requires = array();
                $raw_requires = $data['RequiresPlugins'] ?? ( $headers['RequiresPlugins'] ?? '' );
                foreach ( explode( ',', is_string( $raw_requires ) ? $raw_requires : '' ) as $dependency ) {
                    $dependency = trim( $dependency );
                    if ( preg_match( '/^[a-z0-9]+(?:-[a-z0-9]+)*$/D', $dependency ) ) {
                        $requires[] = $dependency;
                    }
                }
                $wc_minimum = $headers['WCRequiresAtLeast'] ?? '';
                $metadata = array(
                    'file' => $file,
                    'slug' => $slug,
                    'version' => isset( $data['Version'] ) ? sanitize_text_field( $data['Version'] ) : null,
                    'author' => isset( $data['Author'] ) ? sanitize_text_field( $data['Author'] ) : null,
                    'kind' => $kind,
                    'active' => $active,
                    'network_active' => $network_active,
                    'must_use' => $must_use,
                    'requires_plugins' => array_values( array_unique( $requires ) ),
                    'wc_requires_at_least' => is_string( $wc_minimum ) && preg_match( '/^\d+(?:\.\d+){1,3}$/D', $wc_minimum ) ? $wc_minimum : null,
                );
                // Separate prefixes prevent collisions between standard and MU files.
                $nodes[] = new Node( ( $must_use ? 'mu-plugin:' : 'plugin:' ) . $file, 'plugin', 'plugins', $name !== '' ? $name : $file, 'unknown', 0, $metadata );
            }
        }
        return array( 'nodes' => $nodes, 'edges' => array() );
    }
}